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What are the different meanings of the words "they're," "their," and "there" shown in the sentence in the video? "They're really into dressing up in their wizard costumes over there by the river."

In this sentence, "they're" is the contraction of "they are," indicating that the people mentioned are enthusiastic about dressing up in their wizard costumes. On the other hand, "their" is a possessive pronoun indicating that the costumes belong to the people being referred to. Lastly, "there" is used to point out a specific location by the river where the mentioned individuals are engaged in their dressing-up activity.